RESTier OData函数返回EntitySet. “无法从OData路径中找到相关的实体集". [英] RESTier OData Function returning EntitySet. "The related entity set could not be found from the OData path"

问题描述

在RESTier OData上添加了功能

Added a function on RESTier OData

var ambilLocationsByMarketId = new EdmAction(ns, "AmbilLocationsByMarketId", location.GetEdmTypeReference(true), false, null);
model.AddElement(ambilLocationsByMarketId);
var entityContainer = (EdmEntityContainer)model.EntityContainer;
entityContainer.AddActionImport("AmbilLocationsByMarketId", ambilLocationsByMarketId);

在我的DomainController中实现了自定义功能

Implemented the custom function in my DomainController

[HttpGet]
[EnableQuery]
[ODataRoute("AmbilLocationsByMarketId")]
public IHttpActionResult AmbilLocationsByMarketId()
{
    var locations = DbContext.Locations.Where(l => l.Name.Contains("Hotel")).Select(l => l);
    return Ok(locations);
}   

但是我一直得到这个结果作为回报

But I keep getting this result in return

{
  "error": {
    "code": "",
    "message": "An error has occurred.",
    "innererror": {
      "message": "The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; odata.metadata=minimal'.",
      "type": "System.InvalidOperationException",
      "stacktrace": "",
      "internalexception": {
        "message": "The related entity set could not be found from the OData path. The related entity set is required to serialize the payload.",
        "type": "System.Runtime.Serialization.SerializationException",
        "stacktrace": "   at System.Web.OData.Formatter.Serialization.ODataFeedSerializer.WriteObject(Object graph, Type type, ODataMessageWriter messageWriter, ODataSerializerContext writeContext)\\\r\\\n   at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content, HttpContentHeaders contentHeaders)\\\r\\\n   at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)\\\r\\\n--- End of stack trace from previous location where exception was thrown ---\\\r\\\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\\\r\\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\\r\\\n   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()\\\r\\\n   at System.Web.Http.WebHost.HttpControllerHandler.<WriteBufferedResponseContentAsync>d__1b.MoveNext()"
      }
    }
  }
}

如何在RESTier上分配正确的返回EntitySet集合?我想返回对象列表/IQueryable

推荐答案

您需要修改两个地方才能使其正常工作:

There are two places you need to modify to make it work:

1)声明操作时，您需要添加 collection 返回类型.

1) You need to add a collection return type when declaring the action.

2)添加ActionImport时，需要添加EdmEntitySetReferenceExpression.

2) You need to add an EdmEntitySetReferenceExpression when adding the ActionImport.

请参阅

Please see https://github.com/OData/RESTier/blob/master/test/ODataEndToEndTests/Microsoft.Restier.WebApi.Test.Services.Trippin/Domain/TrippinDomain.cs#L177-L189 for an example (though it is a FunctionImport but should apply to an ActionImport too).

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